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Boiler banging and crashing;Was able to easily stop the pump; found plenty of sludge residue in secondary Heat Exchanger. Fitted magnaclean, Magnacleansed system, replaced pump & 2ndary h/ exchanger. All fires well, heat circulates well. On DHW the water is luke warm 35ish degrees. Boiler modulates low. discovered S53 and all that goes with it. Read H/ exchanger is an issue & software fault. Others mention adjust the bypass. If anyone does know please help me out. Thanks.